i can't figure out how to do this patch dynamically.

for some reason (linked to my preset patch for individual interpolation), i need to have several clients (pattr) for the multislider. 

now, to improve it, i would like have a dynamical version. i tried but i can't.

i can't figure out how to do this patch dynamically.
for some reason (linked to my preset patch for individual interpolation), i need to have several clients (pattr) for the multislider. 
i found this and it works well.
now, to improve it, i would like have a dynamical version. i tried but i can't.
any help ?

dynamical size for this patch (num + multislider)